简单的线程工厂

今天药忘吃喽~ 2022-04-03 13:14 180阅读 0赞

public interface ThreadFactory根据需要创建新线程的对象。使用线程工厂就无需再手工编写对 new Thread 的调用了，从而允许应用程序使用特殊的线程子类、属性等等。 此接口最简单的实现就是：

class SimpleThreadFactory implements ThreadFactory {
       public Thread newThread(Runnable r) {
         return new Thread(r);
       }
     }

ThreadFactory factory = Executors.defaultThreadFactory();方法提供了更有用的简单实现，即在返回线程前将已创建线程的上下文设置为已知的值。

import java.util.concurrent.Executors;
    import java.util.concurrent.ThreadFactory;
    import java.util.concurrent.TimeUnit;
    import java.util.concurrent.atomic.AtomicInteger;
    public class TestingThreadFactory implements ThreadFactory{
    	public final AtomicInteger numthread = new AtomicInteger();
    	private final ThreadFactory factory = Executors.defaultThreadFactory();
    	public static void main(String[] args) {
    		Runnable task = new Runnable(){
    			@Override
    			public void run() {
    				while(true){
    					try {
    						TimeUnit.SECONDS.sleep(2);
    					} catch (InterruptedException e) {e.printStackTrace();}
    					System.out.println(Thread.currentThread().getName()+"#运行中");
    				}
    			}
    		};
    		TestingThreadFactory f = new TestingThreadFactory();
    		for(int i=0; i<5; i++){
    			f.newThread(task).start();
    		}
    	}
    	@Override
    	public Thread newThread(Runnable task) {
    		numthread.incrementAndGet();
    		return factory.newThread(task);
    	}
    	/**
    	 * 运行结果：
    	 *  pool-1-thread-2#运行中
    		pool-1-thread-3#运行中
    		pool-1-thread-4#运行中
    		pool-1-thread-1#运行中
    		pool-1-thread-5#运行中
    		pool-1-thread-2#运行中
    		pool-1-thread-4#运行中
    		pool-1-thread-5#运行中
    		pool-1-thread-3#运行中
    		pool-1-thread-1#运行中
    		pool-1-thread-5#运行中
    		pool-1-thread-2#运行中
    	 */
    }